Confirming that tests are being carried out on food, hygienic systems, water and air conditioning systems at the hotel, the chief executive of Thomas Cook has promised he will do everything to “get to the bottom of it”.

The Steigenberger Aqua Magic Hotel in Hurghada, Egypt, where John and Susan Cooper died (Picture: AP)

Peter Fankhauser told Sky News: “We have no real evidence what caused the deaths, but what I can promise is at Thomas Cook we are doing everything to support the family and to support the Egyptian authorities… to get to the bottom of it and to get to the cause.”

He said: “Twenty-four hours after the couple died, we had our specialists… in the hotel. They took probes of the food, of the hygienic systems, of water, as well as the air conditioning systems, and all those probes are now in Egypt. They are now examining and testing the probes and we support them in doing that, but that takes about 10 days.”